/* =============================================================================
   Responsive Design and Components
   Optimized for all screen sizes and accessibility
   ============================================================================= */

/* =============================================================================
   Progress Dashboard Styles
   ============================================================================= */

.progress-dashboard {
  display: grid;
  gap: var(--spacing-xl);
}

.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-card h3 {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.stat-value {
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
  line-height: 1;
}

.stat-change,
.stat-period {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.stat-change.positive {
  color: var(--normal-color);
}

.stat-change.negative {
  color: var(--accent-color);
}

/* Charts Container */
.charts-container {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.chart-card {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.chart-header h3 {
  margin: 0;
  color: var(--primary-color);
}

.chart-controls select {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
}

.chart-container {
  padding: var(--spacing-lg);
  height: 300px;
  position: relative;
}

/* Measurements Log */
.measurements-log {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.log-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.log-header h3 {
  margin: 0;
  color: var(--primary-color);
}

.log-table-container {
  overflow-x: auto;
}

.measurements-table {
  width: 100%;
  border-collapse: collapse;
}

.measurements-table th,
.measurements-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.measurements-table th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.measurements-table td {
  font-size: var(--font-size-sm);
}

.measurements-table .no-data {
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
  padding: var(--spacing-xl);
}

/* =============================================================================
   Goals Section Styles
   ============================================================================= */

.goals-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.goals-sidebar {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(80px + var(--spacing-md));
}

.quick-stats h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.goal-summary {
  margin-bottom: var(--spacing-xl);
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-light);
}

.summary-item:last-child {
  border-bottom: none;
}

.summary-item .label {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.summary-item .value {
  font-weight: 600;
  color: var(--primary-color);
}

.goals-main {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  min-height: 400px;
}

.goals-list {
  padding: var(--spacing-xl);
}

.no-goals-message {
  text-align: center;
  padding: var(--spacing-xxl);
  color: var(--text-secondary);
}

.message-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
}

/* Individual Goal Cards */
.goal-card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--primary-color);
  transition: all var(--transition-fast);
}

.goal-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.goal-card.completed {
  border-left-color: var(--normal-color);
  opacity: 0.8;
}

.goal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.goal-title {
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.goal-status {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.goal-status.active {
  background-color: var(--primary-color);
  color: var(--white);
}

.goal-status.completed {
  background-color: var(--normal-color);
  color: var(--white);
}

.goal-status.paused {
  background-color: var(--overweight-color);
  color: var(--white);
}

.goal-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
}

.goal-progress {
  margin-bottom: var(--spacing-sm);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--border-light);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
  border-radius: 4px;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.goal-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  min-height: 32px;
}

/* =============================================================================
   Education Section Styles
   ============================================================================= */

.education-content {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.education-nav {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  position: sticky;
  top: calc(80px + var(--spacing-md));
}

.education-topics {
  list-style: none;
  padding: 0;
  margin: 0;
}

.education-topics li {
  border-bottom: 1px solid var(--border-light);
}

.education-topics li:last-child {
  border-bottom: none;
}

.topic-link {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.topic-link:hover,
.topic-link:focus {
  background-color: var(--bg-secondary);
  color: var(--primary-color);
  text-decoration: none;
}

.topic-link.active {
  background-color: var(--primary-color);
  color: var(--white);
}

.education-main {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  min-height: 600px;
}

.content-display {
  padding: var(--spacing-xxl);
}

.content-display h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
}

.content-display h4 {
  color: var(--text-primary);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.content-display ul,
.content-display ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.content-display li {
  margin-bottom: var(--spacing-xs);
}

.content-display .highlight-box {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--primary-color);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  border-radius: var(--border-radius);
}

.content-display .warning-box {
  background-color: rgba(243, 156, 18, 0.1);
  border-left: 4px solid var(--overweight-color);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  border-radius: var(--border-radius);
}

.content-display .info-box {
  background-color: rgba(52, 152, 219, 0.1);
  border-left: 4px solid var(--secondary-color);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  border-radius: var(--border-radius);
}

/* =============================================================================
   Insights Section Styles
   ============================================================================= */

.insights-dashboard {
  display: grid;
  gap: var(--spacing-xl);
}

.insights-summary {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.insight-card.primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: var(--white);
  padding: var(--spacing-xxl);
  border-radius: var(--border-radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
  min-width: 300px;
}

.insight-card.primary h3 {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.health-score {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.score-value {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.score-description {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.insight-panel {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.insight-panel h3 {
  background-color: var(--bg-secondary);
  color: var(--primary-color);
  padding: var(--spacing-lg);
  margin: 0;
  border-bottom: 1px solid var(--border-light);
}

.insight-content {
  padding: var(--spacing-lg);
  min-height: 200px;
}

.insight-content p {
  color: var(--text-secondary);
  font-style: italic;
}

.insight-list {
  list-style: none;
  padding: 0;
}

.insight-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.insight-list li:last-child {
  border-bottom: none;
}

.insight-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--white);
}

.insight-icon.positive {
  background-color: var(--normal-color);
}

.insight-icon.warning {
  background-color: var(--overweight-color);
}

.insight-icon.negative {
  background-color: var(--accent-color);
}

/* =============================================================================
   Responsive Design - Tablet
   ============================================================================= */

@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .charts-container {
    grid-template-columns: 1fr;
  }
  
  .goals-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .goals-sidebar {
    position: static;
    order: 2;
  }
  
  .education-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .education-nav {
    position: static;
    order: 2;
  }
  
  .education-topics {
    display: flex;
    overflow-x: auto;
    white-space: nowrap;
  }
  
  .education-topics li {
    border-bottom: none;
    border-right: 1px solid var(--border-light);
    flex-shrink: 0;
  }
  
  .education-topics li:last-child {
    border-right: none;
  }
  
  .topic-link {
    white-space: nowrap;
  }
  
  .insights-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}

/* =============================================================================
   Responsive Design - Mobile
   ============================================================================= */

@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
    position: relative;
  }
  
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 10;
  }
  
  .main-nav.active {
    display: block;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }
  
  .nav-link {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
  }
  
  .nav-link:last-child {
    border-bottom: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg);
    top: 0;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .section-header {
    margin-bottom: var(--spacing-xl);
  }
  
  .section-header h2 {
    font-size: var(--font-size-xl);
  }
  
  .calculator-input-card,
  .calculator-results-card {
    padding: var(--spacing-lg);
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .bmi-number {
    font-size: 3rem;
  }
  
  .dashboard-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }
  
  .stat-card {
    padding: var(--spacing-md);
  }
  
  .stat-value {
    font-size: var(--font-size-xl);
  }
  
  .chart-container {
    height: 250px;
    padding: var(--spacing-md);
  }
  
  .log-table-container {
    font-size: var(--font-size-sm);
  }
  
  .measurements-table th,
  .measurements-table td {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .insights-grid {
    grid-template-columns: 1fr;
  }
  
  .insight-card.primary {
    padding: var(--spacing-xl);
    min-width: auto;
  }
  
  .score-value {
    font-size: 3rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    text-align: center;
  }
}

/* =============================================================================
   Responsive Design - Small Mobile
   ============================================================================= */

@media (max-width: 480px) {
  :root {
    --font-size-base: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 20px;
    --font-size-xxl: 24px;
  }
  
  .container {
    padding: 0 var(--spacing-xs);
  }
  
  .header-content {
    padding: var(--spacing-sm) 0;
  }
  
  .logo h1 {
    font-size: var(--font-size-lg);
  }
  
  .tagline {
    display: none;
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .calculator-input-card,
  .calculator-results-card {
    padding: var(--spacing-md);
  }
  
  .unit-toggle {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .bmi-number {
    font-size: 2.5rem;
  }
  
  .bmi-category {
    font-size: var(--font-size-base);
  }
  
  .dashboard-stats {
    grid-template-columns: 1fr;
  }
  
  .stat-card {
    padding: var(--spacing-sm);
  }
  
  .chart-container {
    height: 200px;
    padding: var(--spacing-sm);
  }
  
  .insight-card.primary {
    padding: var(--spacing-lg);
  }
  
  .score-value {
    font-size: 2.5rem;
  }
  
  .modal-content {
    margin: var(--spacing-sm);
    max-width: calc(100vw - var(--spacing-lg));
  }
  
  .modal-body {
    padding: var(--spacing-md);
  }
}

/* =============================================================================
   High Contrast Mode Support
   ============================================================================= */

@media (prefers-contrast: high) {
  :root {
    --primary-color: #000000;
    --text-primary: #000000;
    --text-secondary: #333333;
    --border-color: #000000;
    --bg-primary: #ffffff;
    --bg-secondary: #f0f0f0;
  }
  
  .btn-primary {
    background-color: #000000;
    border-color: #000000;
    color: #ffffff;
  }
  
  .btn-secondary {
    background-color: #ffffff;
    border-color: #000000;
    color: #000000;
  }
  
  .gauge-section {
    border: 2px solid #000000;
  }
}

/* =============================================================================
   Reduced Motion Support
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .loading::after {
    animation: none;
  }
}

/* =============================================================================
   Print Styles
   ============================================================================= */

@media print {
  .header,
  .footer,
  .mobile-menu-toggle,
  .btn,
  .modal,
  .chart-controls,
  .goal-actions {
    display: none !important;
  }
  
  .main-content {
    margin: 0;
    padding: 0;
  }
  
  .section {
    display: block !important;
    page-break-inside: avoid;
    padding: var(--spacing-md) 0;
  }
  
  .calculator-grid,
  .goals-content,
  .education-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .chart-container {
    height: auto;
    min-height: 200px;
  }
  
  .bmi-results {
    page-break-inside: avoid;
  }
  
  .measurements-table {
    font-size: 12px;
  }
  
  .measurements-table th,
  .measurements-table td {
    padding: 4px 8px;
  }
}